[4.21] net, l2 bridge: Verify iface looping bug fix

[nirdothan]

Short description:

Manual cherry-pick: #4283

More details:

A bug was causing secondary interface to disappear from VMI status.
Validate that kubevirt/kubevirt#17041 had fixed the issue by enhancing the secondary interface stability test.

What this PR does / why we need it:

Which issue(s) this PR fixes:

Special notes for reviewer:

jira-ticket:

https://redhat.atlassian.net/browse/CNV-83920

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[nirdothan]

/verified
tested on a cnv-4.22 cluster
uv run pytest $(cat /home/ndothan/work/python/params) --runxfail tests/network/l2_bridge/vmi_interfaces_stability/test_interfaces_stability.py
Result: ================================================================= 2 passed, 1 deselected, 21 warnings in 988.52s (0:16:28) ==================================================================

[openshift-virtualization-qe-bot-3]

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CRITICAL: Before setting "Run smoke tests: True", you MUST use shell scripts to:
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🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
# Get the list of changed files in PR `#4397`
gh pr diff 4397 --repo RedHatQE/openshift-virtualization-tests --name-only

echo "=== PR diff ==="
gh pr diff 4397 --repo RedHatQE/openshift-virtualization-tests

Length of output: 9392

---

🏁 Script executed:

#!/bin/bash
# Check smoke tests and their dependencies on changed files
echo "=== Smoke tests ==="
rg "pytest.mark.smoke" --type=py -B2 | grep "def test_"

echo ""
echo "=== Smoke tests importing libs.vm.vm or BaseVirtualMachine ==="
rg "from libs.vm.vm|import libs.vm.vm|BaseVirtualMachine" --type=py -l

echo ""
echo "=== Smoke test files importing libs.vm ==="
# Get smoke test files
SMOKE_FILES=$(rg "pytest.mark.smoke" --type=py -l)
echo "Smoke test files:"
echo "$SMOKE_FILES"

echo ""
echo "=== Check if smoke test files use libs.vm.vm ==="
for f in $SMOKE_FILES; do
    if rg -l "from libs.vm|import libs.vm|BaseVirtualMachine|cloud_init_network_data" "$f" 2>/dev/null; then
        echo "MATCH: $f"
    fi
done

echo ""
echo "=== Check cloud_init_network_data usage ==="
rg "cloud_init_network_data" --type=py -n

Length of output: 3670

---

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#!/bin/bash
# Get commit SHA and file info for inline review
gh pr view 4397 --repo RedHatQE/openshift-virtualization-tests --json headRefOid,baseRefOid

echo "=== Files changed with details ==="
gh api repos/RedHatQE/openshift-virtualization-tests/pulls/4397/files --jq '.[].filename'

Length of output: 403

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#!/bin/bash
# Post inline review comment on first changed line of libs/vm/vm.py
gh api repos/RedHatQE/openshift-virtualization-tests/pulls/4397/reviews \
  --method POST \
  --field commit_id="9fe9b4066f24568b73998a987dd511ff27833695" \
  --field body="" \
  --field event="COMMENT" \
  --field "comments[][path]=libs/vm/vm.py" \
  --field "comments[][position]=1" \
  --field "comments[][body]=**Test Execution Plan**

- **Run smoke tests: False** _(No traceable dependency path from smoke tests to any changed code)_
- \`tests/network/l2_bridge/vmi_interfaces_stability/test_interfaces_stability.py\` — both tests modified (dynamic \`expected_num_ifaces\`, second secondary interface added)"

Length of output: 1735

---

---

🧠 Learnings used

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 0
File: :0-0
Timestamp: 2025-12-16T10:28:54.212Z
Learning: In the openshift-virtualization-tests repository, when determining smoke test impact for test execution plans, only set "Run smoke tests: True" if there is a verified, traceable dependency path from smoke tests to the changed code. Session-scoped fixtures or infrastructure-sounding changes do NOT automatically imply smoke test impact - the dependency chain must be explicitly verified using shell scripts before recommending smoke test execution.

---

Learnt from: jpeimer
Repo: RedHatQE/openshift-virtualization-tests PR: 0
File: :0-0
Timestamp: 2025-12-22T15:56:00.157Z
Learning: In the openshift-virtualization-tests repository, when responding to test execution plan requests from openshift-virtualization-qe-bot-3, do NOT use "REQUEST_CHANGES" review type if the PR author has already marked the PR as verified (e.g., with `/verified` command). Test execution plans are informational guides, not blocking requirements. Use COMMENT event for informational test plans, or only REQUEST_CHANGES if there are actual code issues that need to be addressed before merging.

---

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 3062
File: conftest.py:333-333
Timestamp: 2025-12-16T20:11:03.645Z
Learning: In the openshift-virtualization-tests repository, when determining smoke test impact for changes affecting py_config["os_login_param"], follow this verification methodology: (1) Find all smoke tests: `rg "pytest.mark.smoke" --type=py -B2 | grep "def test_"`, (2) For each smoke test file, search for VM creation patterns: `rg "VirtualMachineForTests|running_vm|VirtualMachineForTestsFromTemplate|wait_for_ssh|check_ssh_connectivity"`, (3) Trace the dependency chain: smoke test → VirtualMachineForTests/running_vm() → wait_for_ssh_connectivity() (default enabled) → vm.login_params property → py_config["os_login_param"][vm.os_flavor], (4) Check utilities/virt.py for login_params usage: `rg "os_login_param|login_params" utilities/virt.py -C3`. Any smoke test creating VMs with default SSH connectivity checks (running_vm with check_ssh_connectivity=True) depends on os_login_param, even if the test doesn't directly reference it.

---

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 0
File: :0-0
Timestamp: 2025-09-29T19:05:24.987Z
Learning: For PR `#1904` test execution, the critical validation point is test_connectivity_over_migration_between_localnet_vms which should fail gracefully on cloud clusters but pass on bare-metal/PSI clusters, representing the core nmstate conditional logic functionality.

---

Learnt from: azhivovk
Repo: RedHatQE/openshift-virtualization-tests PR: 4147
File: tests/network/upgrade/test_upgrade_network.py:166-177
Timestamp: 2026-03-19T10:37:02.008Z
Learning: In the openshift-virtualization-tests repository, unused fixture parameters in test methods (e.g., `bridge_on_one_node` in `tests/network/upgrade/test_upgrade_network.py`) that exist purely for pytest dependency ordering should not be flagged for removal, and no follow-up issues need to be opened for them. This is an intentional pattern, consistent with the analogous convention for fixture definitions in this codebase.

---

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 1904
File: tests/network/conftest.py:348-362
Timestamp: 2025-10-27T15:30:06.412Z
Learning: In tests/network/conftest.py, the _verify_nmstate_running_pods function currently runs unconditionally in network_sanity, but rnetser plans to implement marker-based conditional checking (following the pattern of _verify_dpdk, _verify_sriov, etc.) in a future PR after adding nmstate markers to the relevant tests.

---

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 0
File: :0-0
Timestamp: 2025-09-29T19:05:24.987Z
Learning: The test execution plan for PR `#1904` focuses on cluster-type conditional logic where nmstate functionality is bypassed on cloud clusters (Azure/AWS) but fully functional on bare-metal/PSI clusters, requiring different test strategies for each environment type.

---

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 3062
File: conftest.py:333-333
Timestamp: 2025-12-16T15:09:49.597Z
Learning: In the openshift-virtualization-tests repository, when conftest.py or utilities/bitwarden.py changes affect py_config["os_login_param"], smoke test impact must be determined by: (1) finding all smoke tests using `rg "pytest.mark.smoke"`, (2) checking each for VM creation patterns (VirtualMachineForTests, running_vm, VirtualMachineForTestsFromTemplate), (3) tracing whether running_vm is called with default check_ssh_connectivity=True, which accesses vm.login_params property that reads py_config["os_login_param"][vm.os_flavor]. The dependency chain is: smoke test → VM creation → running_vm → wait_for_ssh_connectivity → vm.login_params → os_login_param. Any smoke test creating VMs with SSH connectivity (the default) depends on os_login_param.

---

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 0
File: :0-0
Timestamp: 2025-12-16T14:00:59.076Z
Learning: In the openshift-virtualization-tests repository, when responding to test execution plan requests from openshift-virtualization-qe-bot-3, CodeRabbit must post ONLY an inline review comment on the Files Changed tab and then stop immediately without generating any follow-up comments in the PR discussion thread. No acknowledgment messages, no confirmation of posting, no explanation - silence after posting the inline review equals success. Additional comments create empty/meaningless reviews that clutter the PR.

---

Learnt from: yossisegev
Repo: RedHatQE/openshift-virtualization-tests PR: 3873
File: tests/network/localnet/test_non_udn_localnet.py:7-9
Timestamp: 2026-02-25T10:52:23.378Z
Learning: In the RedHatQE/openshift-virtualization-tests repository, networking infrastructure requirements such as nmstate, localnet bridge mappings, and NIC availability are NOT considered special/platform-specific infrastructure that would warrant a tier3 marker. These are standard test environment capabilities in this repository's test environment, and tests requiring them do not automatically qualify as tier3 unless they involve other truly platform-specific/complex/time-consuming characteristics beyond standard network test infrastructure.

---

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 0
File: :0-0
Timestamp: 2025-12-16T14:06:22.391Z
Learning: In the openshift-virtualization-tests repository, when posting test execution plan inline review comments using GitHub API, the full test execution plan content must go in the `comments[].body` field (which appears on Files Changed tab), NOT in the top-level `body` field (which appears in PR discussion thread). The top-level `body` field should be omitted or left empty to avoid posting redundant comments in the PR discussion thread.

---

Learnt from: yossisegev
Repo: RedHatQE/openshift-virtualization-tests PR: 3358
File: tests/network/sriov/test_sriov.py:21-21
Timestamp: 2026-01-07T09:52:22.771Z
Learning: For PRs that only remove or modify pytest markers (like removing pytest.mark.post_upgrade) without changing test logic in openshift-virtualization-tests, collection verification using `pytest --collect-only` is sufficient. Full test execution is not required to verify marker-only changes.

---

Learnt from: EdDev
Repo: RedHatQE/openshift-virtualization-tests PR: 3612
File: tests/network/user_defined_network/ip_specification/test_ip_specification.py:10-10
Timestamp: 2026-01-26T20:29:54.623Z
Learning: In the RedHatQE/openshift-virtualization-tests repository, when introducing STD (Standard Test Definition) PRs that define test case structure without implementation, it's acceptable and intentional to use `__test__ = False` to block pytest collection until the tests are fully implemented in a follow-up PR. The STD workflow involves: (1) defining test structure, markers, and documentation first, (2) implementing the actual test logic and removing the collection blocker in a subsequent PR.

---

Learnt from: dshchedr
Repo: RedHatQE/openshift-virtualization-tests PR: 4118
File: utilities/database.py:0-0
Timestamp: 2026-03-17T01:32:13.674Z
Learning: In RedHatQE/openshift-virtualization-tests, maintainer dshchedr prefers CodeRabbit to post targeted inline comments on the Files changed tab for each applicable location rather than aggregating multiple issues into a single discussion thread.

---

Learnt from: dshchedr
Repo: RedHatQE/openshift-virtualization-tests PR: 4118
File: utilities/database.py:0-0
Timestamp: 2026-03-17T01:32:13.674Z
Learning: In RedHatQE/openshift-virtualization-tests, maintainer dshchedr prefers CodeRabbit to post targeted inline comments on the Files Changed tab at each applicable location rather than aggregating multiple issues into a single PR discussion thread reply.

---

Learnt from: servolkov
Repo: RedHatQE/openshift-virtualization-tests PR: 1776
File: libs/net/node_network.py:25-31
Timestamp: 2025-08-20T23:43:28.117Z
Learning: In the RedHatQE/openshift-virtualization-tests project, servolkov's team always uses bare metal (BM) clusters with IPv4 setup in their testing environment, making defensive checks for IPv4 data presence potentially redundant in their networking code.

---

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 3371
File: scripts/tests_analyzer/compare_coderabbit_decisions.py:199-289
Timestamp: 2026-01-13T10:06:14.822Z
Learning: In the openshift-virtualization-tests repository, user rnetser prefers to keep pagination loops inline rather than extracting them into generic helper functions when the loops have different URL patterns and unique post-processing logic, as the inline approach improves readability and makes each endpoint's behavior more explicit.

---

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 3228
File: .coderabbit.yaml:30-41
Timestamp: 2026-01-05T10:33:55.037Z
Learning: In the openshift-virtualization-tests repository, user rnetser prefers minimal pre-merge checks in CodeRabbit configuration: only docstrings enforcement (80% threshold) is needed, not title or description checks.

---

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 2469
File: utilities/sanity.py:139-142
Timestamp: 2025-11-08T07:36:57.616Z
Learning: In the openshift-virtualization-tests repository, user rnetser prefers to keep refactoring PRs (like PR `#2469`) strictly focused on moving/organizing code into more granular modules without adding new functionality, error handling, or behavioral changes. Such improvements should be handled in separate PRs.

---

Learnt from: jpeimer
Repo: RedHatQE/openshift-virtualization-tests PR: 1160
File: tests/storage/storage_migration/test_mtc_storage_class_migration.py:165-176
Timestamp: 2025-06-17T07:45:37.776Z
Learning: In the openshift-virtualization-tests repository, user jpeimer prefers explicit fixture parameters over composite fixtures in test methods, even when there are many parameters, as they find this approach more readable and maintainable for understanding test dependencies.

---

Learnt from: jpeimer
Repo: RedHatQE/openshift-virtualization-tests PR: 3571
File: tests/storage/storage_migration/utils.py:158-167
Timestamp: 2026-01-25T13:18:26.819Z
Learning: In the openshift-virtualization-tests repository, user jpeimer prefers to avoid nitpicky style changes (e.g., removing `.keys()` from dict membership checks) because verifying every change is expensive. Be cautious about suggesting low-impact stylistic improvements that require verification overhead.

---

Learnt from: akri3i
Repo: RedHatQE/openshift-virtualization-tests PR: 1210
File: tests/virt/cluster/general/mass_machine_type_transition_tests/conftest.py:24-64
Timestamp: 2025-06-23T19:28:20.281Z
Learning: In OpenShift Virtualization mass machine type transition tests, the machine type glob pattern "pc-q35-rhel8.*.*" is intentionally hard-coded in the kubevirt_api_lifecycle_automation_job as it's used only once for this specific test case, with plans to update it in the future if the job needs to support other machine types.

---

Learnt from: RoniKishner
Repo: RedHatQE/openshift-virtualization-tests PR: 1411
File: utilities/os_utils.py:246-279
Timestamp: 2025-07-22T17:13:59.166Z
Learning: In the RedHatQE/openshift-virtualization-tests repository, CentOS preferences follow the format "centos-stream<version>" (e.g., "centos-stream9", "centos-stream10"). The generate_instance_type_centos_os_matrix function correctly uses regex to extract numeric versions and constructs the latest version string in the same format as the input preferences for proper comparison.

---

Learnt from: geetikakay
Repo: RedHatQE/openshift-virtualization-tests PR: 4113
File: utilities/virt.py:148-151
Timestamp: 2026-03-09T18:30:21.929Z
Learning: In the openshift-virtualization-tests repository, the `status.interfaces` list on a VirtualMachineInstance (VMI) is populated exclusively by the KubeVirt guest agent reporting guest OS interfaces. Pod-level network interfaces (e.g., loopback, Docker bridge, or other host-network-namespace interfaces) can never appear in this list. Therefore, iterating `all(iface.get("interfaceName") for iface in interfaces)` over `vmi.instance.status.interfaces` is safe and will not be polluted by unexpected external interfaces.

---

Learnt from: azhivovk
Repo: RedHatQE/openshift-virtualization-tests PR: 3974
File: tests/network/localnet/test_ovs_bridge.py:30-43
Timestamp: 2026-03-12T17:49:12.363Z
Learning: In `tests/network/localnet/test_ovs_bridge.py` and `tests/network/localnet/test_jumbo_frames.py`, predicates and assertions checking for a specific count or non-empty list of `filter_link_local_addresses(iface.ipAddresses)` results after `lookup_iface_status` are redundant. VMs in localnet tests are provisioned with explicit IPv4/IPv6 addresses via `ip_addresses_from_pool`, and session-scoped sanity checks guarantee at least one IP family is active. Do not suggest count-based or empty-guard predicates on `ipAddresses` in localnet OVS bridge or jumbo frame tests.

---

Learnt from: azhivovk
Repo: RedHatQE/openshift-virtualization-tests PR: 3974
File: tests/network/localnet/test_jumbo_frames.py:0-0
Timestamp: 2026-03-12T17:47:23.380Z
Learning: In `tests/network/localnet/test_jumbo_frames.py`, an empty-list assertion on `vm2_addresses` (result of `filter_link_local_addresses(iface.ipAddresses)`) after `lookup_iface_status` is redundant. VMs are provisioned with explicit IPv4/IPv6 addresses via `ip_addresses_from_pool`, and session-scoped sanity checks guarantee at least one IP family is active. Do not flag missing empty-list guards on `filter_link_local_addresses` results in localnet tests.

---

Learnt from: azhivovk
Repo: RedHatQE/openshift-virtualization-tests PR: 3598
File: tests/network/sriov/conftest.py:62-71
Timestamp: 2026-01-28T17:36:14.188Z
Learning: In the RedHatQE/openshift-virtualization-tests repository, sanity checks validate that the cluster supports at least one IP family (IPv4 or IPv6) before SR-IOV tests run. Therefore, defensive guards checking for empty IP addresses in SR-IOV VM fixtures (like `sriov_vm` in tests/network/sriov/conftest.py) are not necessary—if neither `ipv4_supported_cluster` nor `ipv6_supported_cluster` is True, the cluster is considered broken and will fail sanity validation.

---

Learnt from: geetikakay
Repo: RedHatQE/openshift-virtualization-tests PR: 4113
File: utilities/virt.py:150-150
Timestamp: 2026-03-23T14:45:02.812Z
Learning: In utilities/virt.py, the condition `reported_names == expected_names` in `wait_for_vm_interfaces` uses intentional exact-set matching (not subset `<=`). This is by design because `status.interfaces` are derived from the VM spec via the KubeVirt guest agent, so extra interfaces are not expected in practice. Using subset matching would mask unexpected interfaces that should be investigated. The strict equality check is the correct invariant for this function.

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Learnt from: azhivovk
Repo: RedHatQE/openshift-virtualization-tests PR: 3619
File: tests/network/user_defined_network/test_user_defined_network.py:97-97
Timestamp: 2026-01-27T17:18:59.661Z
Learning: In tests/network/ modules, the lookup_iface_status_ip function from libs.net.vmspec has built-in error handling that provides descriptive error messages when VM IP lookup fails. Additional assertion messages for IP presence checks using this function are redundant.

[openshift-virtualization-qe-bot-5]

Clean rebase detected — no code changes compared to previous head (9fe9b40).
The following labels were preserved: verified, commented-coderabbitai[bot].

[openshift-virtualization-qe-bot-2]

Clean rebase detected — no code changes compared to previous head (cc7c903).
The following labels were preserved: verified, lgtm-EdDev, commented-coderabbitai[bot], lgtm-azhivovk.

[EdDev]

/approve

[rnetser]

/approve
/lgtm

[yossisegev]

Thank you

[nirdothan]

/cherry-pick cnv-4.20

[openshift-virtualization-qe-bot]

Cherry-pick requested for PR: [4.21] net, l2 bridge: Verify iface looping bug fix by user nirdothan
Adding label/s cherry-pick-cnv-4.20 for automatic cherry-pick once the PR is merged

[openshift-virtualization-qe-bot-2]

Manual cherry-pick is needed
Cherry pick failed for 6a67727 to cnv-4.20:
To cherry-pick run:

git remote update
git checkout cnv-4.20
git pull origin cnv-4.20
git checkout -b ip-loop-bugfix-cnv-4.21-cnv-4.20
git cherry-pick 6a677276df9c77067be719dcc4b31f9a1a7fbd64
# If the above fails with 'is a merge but no -m option', run:
# git cherry-pick -m 1 6a677276df9c77067be719dcc4b31f9a1a7fbd64
git push origin ip-loop-bugfix-cnv-4.21-cnv-4.20

[openshift-virtualization-qe-bot-2]

New container for quay.io/openshift-cnv/openshift-virtualization-tests:cnv-4.21 published

[nirdothan]

/cherry-pick cnv-4.19

[openshift-virtualization-qe-bot]

Manual cherry-pick is needed
Cherry pick failed for 6a67727 to cnv-4.19:
To cherry-pick run:

git remote update
git checkout cnv-4.19
git pull origin cnv-4.19
git checkout -b ip-loop-bugfix-cnv-4.21-cnv-4.19
git cherry-pick 6a677276df9c77067be719dcc4b31f9a1a7fbd64
# If the above fails with 'is a merge but no -m option', run:
# git cherry-pick -m 1 6a677276df9c77067be719dcc4b31f9a1a7fbd64
git push origin ip-loop-bugfix-cnv-4.21-cnv-4.19